Evo ti objasnjenja koje je na ovom forumu pre par godina postovao "puRe":
This is because the Duende bus comp is modelled on an analogue design.
As you probably know digital cannot go above 0db. Therefore a reference level is used where full digital scale (0dbfs) is equal to +18db in the analogue domain. This means 0db in the analogue domain is equal to -18dbfs.
If for example your threshold was set at +10db, this would equate to -8dbfs; 8db below digital full scale.
Hope this makes sense.
Nema tu nikakvog expandera,i btw,ne pise se treshold vec tHreshold(da budemo precizni

)
Poz.